As it happens, I checked out the .tcz's, one of them said 0kb and the other seemed of normal size, I deleted them, re-downloaded and then loaded them, worked like a charm.
Maybe it is just the USB being a bit naff, either way its up and running now, thanks alot guys youv been very helpful :-)
Oh I've done my homework on it, there is an issue with flash drives, not specific to TC.. Think your right about this one though!